10 Questions
In Hot Mix Asphalt mix design, the presence of unbound asphalt on the pavement surface is known as Bleeding.
True
An air void percentage of 1% is considered desirable for a surface coarse mix in Hot Mix Asphalt design.
False
Ravelling (Stripping) in Hot Mix Asphalt mix design is the result of excessive voids in the mineral aggregate (VMA).
False
Hot Mix Asphalt (HMA) is used to increase the load carrying capacity of the road and improve ride quality.
True
Stone Mastic Asphalt (SMA) focuses on having a small proportion of stones to enhance flexibility under heavy truck loads.
False
Superior Performing Asphalt Pavements (SuperPave) uses a performance-based characterization system called PG to improve short-term pavement performance.
False
The Marshall test determines the optimum aggregate size for asphalt mix design.
False
Hot Mix Asphalt can only be placed and compacted at high ambient temperatures.
False
Reclaimed Asphalt Pavement (RAP) content is higher in Cold Mix Asphalt compared to Hot Mix Asphalt.
True
Cold mix materials are only suitable for high-traffic urban roads.
False
Study Notes
Hot Mix Asphalt (HMA) Mix Design
- Bleeding in HMA occurs when unbound asphalt is present on the pavement surface.
- A desirable air void percentage in a surface coarse mix is 1%.
Mix Design and Performance
- Ravelling (Stripping) in HMA occurs due to excessive voids in the mineral aggregate (VMA).
- HMA is used to increase the load-carrying capacity of roads and improve ride quality.
Types of Asphalt
- Stone Mastic Asphalt (SMA) has a small proportion of stones to enhance flexibility under heavy truck loads.
- Superior Performing Asphalt Pavements (SuperPave) uses a performance-based characterization system (PG) to improve short-term pavement performance.
Testing and Placement
- The Marshall test determines the optimum aggregate size for asphalt mix design.
- Hot Mix Asphalt can only be placed and compacted at high ambient temperatures.
Reclaimed Asphalt Pavement (RAP)
- RAP content is higher in Cold Mix Asphalt compared to Hot Mix Asphalt.
Cold Mix Asphalt
- Cold mix materials are only suitable for high-traffic urban roads.
Test your knowledge on the mix design process for Hot Mix Asphalt (HMA) which focuses on evaluating the quality of the mixture and the relative amounts of aggregate and asphalt cement to achieve desired properties like stability, flexibility, impermeability, and structural capacity.
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